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https://issues.apache.org/jira/browse/HADOOP-7424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uma Maheswara Rao G updated HADOOP-7424:
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Status: Patch Available (was: Open)
> Log an error if the topology script doesn't handle multiple args
> ----------------------------------------------------------------
>
> Key: HADOOP-7424
> URL: https://issues.apache.org/jira/browse/HADOOP-7424
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Eli Collins
> Labels: newbie
> Attachments: HADOOP-7424.patch
>
>
> ScriptBasedMapping#resolve currently warns and returns null if it passes n
> arguments to the topology script and gets back a different number of
> resolutions. This indicates a bug in the topology script (or it's input) and
> therefore should be an error.
> {code}
> // invalid number of entries returned by the script
> LOG.warn("Script " + scriptName + " returned "
> + Integer.toString(m.size()) + " values when "
> + Integer.toString(names.size()) + " were expected.");
> return null;
> {code}
> There's only one place in Hadoop (FSNamesystem init) where we pass multiple
> arguments to the topology script, and it only done for performance (to
> trigger resolution/caching of all the hosts in the includes file on startup).
> So currently a topology script that doesn't handle multiple arguments just
> means the initial cache population doesn't work.
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